<?php
class Application_Model_Uf extends Zend_Db_Table
{
    protected $_name    = 'tb_uf';
    protected $_primary = array('id_uf');

    public function getUfs()
    {
        $select = $this->select()
                       ->from($this, array('id_uf', 'ds_uf'));
        $rowSet = $this->fetchAll($select);

        $ufs = array('' => 'Selecione');
        if ($rowSet) {
            foreach($rowSet as $uf) {
                $ufs[$uf->id_uf] = $uf->ds_uf;
            }
        }

        return $ufs;
    }
}